New pressure-treated deck? When to stain it

Brand-new deck? Don't stain it the day the builder leaves, and don't wait three years either.

Why you wait

Pressure-treated lumber comes from the yard wet. Home Depot's guide says it can take several weeks to dry¹. Stain put on wet wood can't soak in. It sits on top and flakes off.

The Forest Products Lab's deck guide says wood that was treated with a water repellent at the factory, or recently treated, should weather for about 2 to 3 months before finishing².

The 10-minute sprinkle test

Sprinkle some water on a few boards in the sun and a few in the shade.
Watch for 10 minutes.
If it soaks in, the wood is ready. Plan to stain soon. If it beads up or pools, give it more time¹.

One exception: lumber stamped KDAT (kiln dried after treatment) has already been dried and can be stained right away¹.

Why you don't wait too long

Bare wood in the sun turns gray within a season or two. That gray layer is damaged surface fiber. Stain won't stick well to it until it's cleaned and brightened, which adds a step and cost. The Forest Products Lab notes that most decks are retired early because of cracks and checks that timely finishing could have prevented².

Our advice for a new deck

Do the sprinkle test every few weeks after the deck is built.
When it passes, book the first coat. For most decks that's within the first year.
Ask about a maintenance plan. A new deck is the cheapest one to keep looking new.